Tag
#fixturing
2 topics across all disciplines.
Datums and datum reference frames
Why three datums and not one, how 3-2-1 location removes six degrees of freedom, what datum precedence actually changes, and why the fixture, the gauge and the drawing must all agree.
Welding distortion and fixturing
Why weld shrinkage moves a part in three different ways, how a fixture locates rather than forces, why sheet metal needs N-2-1 instead of 3-2-1, and how weld sequence is used to make distortions cancel.